Correct ... it is the 3-button homelink.
Button 1 - Garage Door
Button 2 - Activate ExhaustMeister
Button 3 - DeActivate ExhaustMeister
What is the ExhaustMeister you ask? Electronically control the exhaust flaps to be able to have the flaps fully opened with the push of a button for that louder exhaust when you want it, or when you don't
http://www.exhaustmeister.com/